Peter (fl. 1863) (also known as Gordon, or "Whipped Peter", or "Poor Peter") was an escaped American slave who was the subject of photographs documenting the extensive keloid scarring of his back from whippings received in slavery. The "scourged back" photo became one of the most widely circulated photos of the abolitionist movement during the American Civil War and remains one of the most notable photos of the 19th-century United States.
Just take a look at the picture in the post. You can see the physical traces slavery has caused to this man. And those traces look about like that every time some people think they are worth much more than some other people,
What's being done by the Russia in Ukraine is mostly* not slavery, but it's a situation where one people thinks its worth more than another. What these two things have to do with each other is physical torture of human beings, for similar reasons.
*) apparently some of the kidnapped children have been used in slave work of some kind, or at least have been meant to be, judging from the Russian-compiled catalogue of kidnapped Ukrainian children that saw it important to tell of many children how obeyant and docile they are